html   
    head
    body        
        -for(var i=0;i<arr.length;i++)
            div=arr[i]
        
        -var a=10;
        -if(a%2==0)
            div(style={background:'red'}) 偶数
        -else
            div(style={background:'green'}) 奇数
        
        -var b=1;
        case b
            when 0
                div aaa
            when 1
                div bbb
            when 2
                div ccc
            default
                |no find ......